Julabo FLW4006 Circulating Chiller

Overview

The Julabo FLW4006 is a high-capacity, water-cooled circulating chiller engineered for precision temperature control in demanding laboratory and pilot-scale industrial applications. It operates on the vapor-compression refrigeration cycle, utilizing a single-stage hermetic compressor charged with R404A refrigerant—a blend selected for balanced thermodynamic performance across extended low-temperature operation. Designed to replace municipal tap-water cooling, the FLW4006 delivers consistent thermal management for exothermic instrumentation—including NMR spectrometers, laser systems, X-ray diffractometers, vacuum pumps, and analytical chromatography detectors—while reducing water consumption and eliminating risks associated with variable supply pressure or temperature drift. Its integrated architecture combines refrigeration, circulation, and fluid conditioning in a single robust enclosure, minimizing footprint without compromising service accessibility or long-term reliability.

Key Features

• Wide operational temperature range of −15 to +40 °C with stability maintained within ±0.5 °C under dynamic load conditions
• High-flow circulation system delivering up to 60 L/min at adjustable pressures from 0.5 to 6.0 bar—optimized for low-resistance and high-resistance external loops alike
• Large reservoir volume (24–30 L) minimizes thermal inertia and supports stable setpoint maintenance during transient heat loads
• Water-cooled condenser design enables operation in ambient environments up to 40 °C without performance derating, provided adequate facility cooling water supply (≤32 °C inlet, ≥3 bar pressure)
• Dual-port configuration: G1¼” external-thread pump ports for primary loop connection; G¾” external-thread cooling water inlet with integrated ½” hose barb adapter
• LED-based digital temperature display with 0.1 °C resolution and intuitive keypad interface for setpoint entry, alarm acknowledgment, and status monitoring
• Integrated level and pressure sensors (on FLW4006 and higher models) provide real-time feedback for preventive maintenance and system diagnostics
• Compatibility with common heat-transfer fluids including deionized water, ethylene glycol/water mixtures (up to 50 % v/v), and Julabo-certified Thermal Bath Fluids—ensuring corrosion resistance and long-term pump seal integrity

Sample Compatibility & Compliance

The FLW4006 is not a sample-contacting instrument; rather, it serves as a closed-loop thermal regulation platform for externally connected equipment. Its fluid-handling components—including stainless steel reservoir, EPDM-sealed pump head, and brass/brass-plated fittings—are chemically compatible with standard laboratory coolants per ISO 8502-3 and ASTM D1384 guidelines. The unit complies with EU Directive 2014/68/EU (PED) for pressure equipment, EN 61000-6-3 (EMC emissions), and EN 61000-6-2 (EMC immunity). R404A refrigerant usage adheres to F-Gas Regulation (EU) No. 517/2014 reporting requirements. Optional RS232 or Profibus interfaces support integration into centralized building management systems (BMS) and enable audit-ready logging when paired with compliant SCADA software—aligning with GLP and GMP documentation expectations for regulated laboratories.

Software & Data Management

While the FLW4006 operates autonomously via its front-panel controller, optional digital interfaces facilitate remote supervision and data traceability. The RS232 port supports ASCII-based command protocols for reading real-time values (setpoint, actual temperature, pump status, error codes) and writing configuration parameters. When interfaced with Julabo’s proprietary LabView-compatible drivers or third-party OPC UA gateways, the chiller can feed time-stamped thermal logs into LIMS or ELN platforms. All communication events—including parameter changes and alarm triggers—are timestamped and retainable for ≥30 days onboard, satisfying basic FDA 21 CFR Part 11 record-keeping prerequisites when deployed in validated environments. No embedded web server or cloud connectivity is included; all data exchange remains local and network-isolated by default.

Applications

• Stabilization of high-field NMR magnet cryocoolers and probe preamplifiers requiring sub-ambient thermal anchoring
• Cooling of high-power CO₂ and fiber lasers in materials processing and biomedical optics setups
• Thermal conditioning of rotary evaporators, falling-film concentrators, and jacketed reactors in synthetic chemistry workflows
• Heat rejection for mass spectrometer ion sources and detector electronics operating under vacuum
• Temperature-controlled testing of electronic components and semiconductor packaging under accelerated life-cycle conditions
• Support of calorimetry systems where precise bath temperature reproducibility directly impacts ΔH quantification accuracy

FAQ

What is the maximum allowable return fluid temperature for the FLW4006?
The unit accepts return fluid temperatures up to 80 °C—enabling safe integration with equipment that discharges warm effluent, such as certain vacuum pumps or heated reaction jackets.
Can the FLW4006 operate without facility cooling water?
No. As a water-cooled chiller, it requires a continuous supply of facility cooling water (G¾” connection) at ≤32 °C inlet temperature and ≥3 bar pressure to reject condenser heat. Air-cooled alternatives are available in Julabo’s FC and SC series.
Is glycol mixture concentration limited to 50 % v/v?
Yes. Exceeding 50 % ethylene or propylene glycol reduces heat capacity and increases viscosity beyond the pump’s hydraulic design envelope, risking cavitation and reduced flow stability.
Does the FLW4006 include built-in leak detection or dry-run protection?
It features flow-sensing circuitry that triggers an alarm and halts compressor operation if circulation falls below 15 L/min for >30 seconds—providing indirect dry-run mitigation but no physical leak sensor.
How often does the R404A refrigerant require servicing?
Under normal operation and leak-free installation, the sealed refrigeration circuit requires no scheduled refrigerant replenishment. Annual verification of charge integrity and compressor oil condition is recommended per Julabo Maintenance Protocol 7.2.